Philips Semiconductors
Product specification
74ALVT16646
2.5V/3.3V 16-bit bus transceiver (3-State)
2
1998 Feb 13
853-1856 18962
FEATURES
16-bit universal bus interface
5V I/O Compatible
3-State buffers
Output capability: +64mA/-32mA
TTL input and output switching levels
Input and output interface capability to systems at 5V supply
Bus-hold data inputs eliminate the need for external pull-up
resistors to hold unused inputs
Live insertion/extraction permitted
No bus current loading when output is tied to 5V bus
Power-up reset
Power-up 3-State
Latch-up protection exceeds 500mA per JEDEC Std 17
ESD protection exceeds 2000V per MIL STD 883 Method 3015
and 200V per Machine Model
DESCRIPTION
The 74ALVT16646 is a high-performance BiCMOS product
designed for V
CC
operation at 2.5V or 3.3V with I/O compatibility up
to 5V.
This device is a 16-bit transceiver featuring non-inverting 3-State
bus compatible outputs in both send and receive directions. The
control function implementation minimizes external timing
requirements. The device features an Output Enable (OE) input for
easy cascading and a Direction (DIR) input for direction control.
Data on the A or B bus is clocked into the registers on the Low to
High transition of the appropriate clock (CPAB or CPBA). The
select-control (SAB and SBA) inputs can multiplex stored and
real-time (transparent mode data).
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
SYMBOL
PARAMETER
T
amb
= 25
C
2.5V
3.3V
UNIT
t
PLH
t
PHL
Propagation delay
nAx to nBx or nBx to nAx
C
L
= 50pF
2.2
2.3
1.7
1.8
ns
C
IN
Input capacitance DIR, OE
V
I
= 0V or V
CC
3
3
pF
C
I/O
I/O pin capacitance
V
I/O
= 0V or V
CC
9
9
pF
I
CCZ
Total supply current
Outputs disabled
40
70
A
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
OUTSIDE NORTH AMERICA
NORTH AMERICA
DWG NUMBER
56-Pin Plastic SSOP Type III
40
C to +85
C
74ALVT166646 DL
AV16646 DL
SOT371-1
56-Pin Plastic TSSOP Type II
40
C to +85
C
74ALVT16646 DGG
AV16646 DGG
SOT364-1
Philips Semiconductors
Product specification
74ALVT16646
2.5V/3.3V 16-bit bus transceiver (3-State)
1998 Feb 13
4
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
27
28
30
29
1DIR
1CPAB
1SAB
GND
1A0
1A1
1A2
1A3
1A4
GND
1A5
1A6
1A7
2A0
2A2
GND
2A3
VCC
2A1
2A4
2A5
2A6
2A7
2SAB
VCC
GND
2CPAB
2DIR
1OE
1CPBA
1SBA
GND
1B0
1B1
1B2
1B3
1B4
GND
1B5
1B6
1B7
2B0
2B2
GND
2B3
VCC
2B1
2B4
2B5
2B6
2B7
2SBA
VCC
GND
2CPBA
20E
SH00026
LOGIC SYMBOL
2
3
1CPAB
1SAB
1
1DIR
55
1CPBA
27
26
2CPAB
2SAB
28
2DIR
30
2CPBA
54
1SBA
56
1OE
31
2SBA
29
2OE
5
9
10
12
13
14
6
8
52
51
49
48
47
45 44
43
15
16
17
19
20
21 23
24
42
41
40
38
37
36 34
33
1A0 1A1 1A2 1A3 1A4 1A5 1A6 1A7
1B0 1B1 1B2 1B3 1B4 1B5 1B6 1B7
2A0 2A1 2A2 2A3 2A4 2A5 2A6 2A7
2B0 2B1 2B2 2B3 2B4 2B5 2B6 2B7
SH00027
PIN DESCRIPTION
PIN NUMBER
SYMBOL
NAME AND FUNCTION
2, 55, 27, 30
1CPAB, 1CPBA, 2CPAB, 2CPBA
Clock input A to B / Clock input B to A
3, 54, 26, 31
1SAB, 1SBA, 2SAB, 2SBA
Select input A to B / Select input B to A
1, 28
1DIR, 2DIR
Direction control inputs
5, 6, 8, 9, 10, 12, 13, 14
15, 16, 17, 19, 20, 21, 23, 24
1A0 - 1A7,
2A0 - 2A7
Data inputs/outputs (A side)
52, 51, 49, 48, 47, 45, 44, 43
42, 41, 40, 38, 37, 36, 34, 33
1B0 - 1B7,
2B0 - 2B7
Data inputs/outputs (B side)
56, 29
1OE, 2OE
Output enable inputs
4, 11, 18, 25, 32, 39, 46, 53
GND
Ground (0V)
7, 22, 35, 50
V
CC
Positive supply voltage
Philips Semiconductors
Product specification
74ALVT16646
2.5V/3.3V 16-bit bus transceiver (3-State)
1998 Feb 13
5
The following examples demonstrate the four fundamental
bus-management functions that can be performed with the
74ALVT16646.
}
REAL TIME BUS TRANSFER
BUS B TO BUS A
nOE
nDIR nCPAB nCPBA nSAB nSBA
L
L
X
X
X
L
}
REAL TIME BUS TRANSFER
BUS A TO BUS B
nOE
nDIR nCPAB nCPBA nSAB nSBA
L
H
X
X
L
X
}
STORAGE FROM
A, B, OR A AND B
nOE
nDIR nCPAB nCPBA nSAB nSBA
L
H
X
X
X
L
L
X
X
X
H
X
X
X
}
TRANSFER STORED DATA
TO A OR B
nOE
nDIR nCPAB nCPBA nSAB nSBA
L
L
X
H | L
X
H
L
H
H | L
X
H
X
A
B
A
B
A
B
A
B
SH00028
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